Owner self-reported — never independently field-inspected
Location confidence
No coordinate anomaly detected
Terrain cross-check (USGS 3DEP)
FAA 128 ft MSL · USGS ground 60 ft · Δ 68 ft
Differential consistent with an elevated / rooftop pad
Structure cross-check (Overture / OSM)
On a building footprint — height not tagged in the source
Building height ≈ 11 ft — measured independently of the FAA record
Cross-source consensus
Corroborated — terrain and structure agree (2/2 sources)
Cross-checked against independent public data — USGS 3DEP terrain, Overture/OSM building footprints, the federal hospital registry, and measured dimensions. The State of the U.S. Heliport Record →
The recorded pad is 50 ft short of the 100 ft footprint an eVTOL would need — shown to scale.
recorded pad eVTOL FATO
Recorded pad (limiting side)
50 ft
eVTOL FATO required
100 ft
FAA EB-105 vertiport pattern — 2× a ~50 ft eVTOL controlling dimension, plus a 125 ft safety-area side.
Load-bearing FATO
100 × 100 ft must be structural
No heliport precedent — typically the binding gate for rooftop and hospital pads.
Obstruction clearance
Clear — no obstructions within 0.5 nm on the FAA obstacle file
Measured against FAA pad geometry and federal FATO sizing (EB-105). A dimensional pre-screen — site-level validation required, and independent of the underwriting risk score.
NFPA 418 adoption status not yet assessed for this jurisdiction.
FAA facility data
FAA LID
CL64
AIX ID
aix:hp:7XDW545N
Lat / Lng
37.55747, -121.97814
Elevation
128 ft MSL
Pad dimensions
50 × 50 ft
Surface type
ROOF-TOP
Surface condition
EXCELLENT
Activation date
1986/07
Last owner update
2020/02/25
FAA OEAAA airspace determinations1
Airspace clearance
On file as archived / procedural records — no standing clearance to track.
Filing activity
Most recent determination 2013-09-03
NRAARCH-DeterminedASN 2013-AWP-1392-NRA2015-07-13
Heliport · 128 ft AGL — Relocation of Helistop. Proposed FATO is 109 ft. x 109 ft. TLOF is 65 ft. x 65 ft. magnetic direction of ingress/egress routes are 109 degrees through 289 degrees and 289 degrees through 109 degrees. Surface type is rooftop metal.
Blueprint
The record vs. what we measured
64/100
DATA INTEGRITY
Surface elevation
The FAA record places this pad at 128 ft. USGS terrain plus the building put the actual rooftop at 71 ft — a -57 ft difference the federal record doesn’t carry.
eVTOL footprint
The 50 ft pad is 50 ft short of the 100 ft an eVTOL FATO requires (measured).
SIGNALFEDERAL RECORDMEASURED
Surface elevation128 ft71 ft · USGS+structure
Structurenot on recordOn a building
Pad dimensions50 ft side (filed)50 ft side · measured
Coordinate integrityas filedterrain cross-checked
Independent inspectionowner self-reportednone on record
✓Federal record
→
✓Cross-checkedUSGS · Overture · dimensions
→
3Physically verifiedGround Truth capture
Obstructions, exact FATO geometry, surface condition, and downwash exposure require a physical Ground Truth capture — not shown above as measured. A field verification completes the record and writes the measured truth to this facility’s authority.
This page is the public data-integrity record. The full RiskIndex assessment — Q1–Q5 compliance, dimensional / FATO analysis, an underwriting-grade risk score, peer benchmark, and a sealed Site Intelligence Report — is available on request.
WASHINGTON HOSPITAL PARKING STRUCTURE, FREMONT, CA (FAA CL64). AirIndex facility record aix:hp:7XDW545N. Verifiable at https://www.airindex.io/verify/aix:hp:7XDW545N.